533 



PRODUCTION 



XIX 



reflecling furface, which when feeii more obliquely become thicker ; 

 and then refle6ls thofe colours, which pafled through thinner plates; 

 in the fame manner as the red light of the fetting fun is refleded 

 from glafs windows, feen very obliquely by the obferver. 



The colours of fl 



therefore, as they are not variable by 



obliquity, with which they are feen, like thofe of mother-pearl card 



fifh, do not depend on the thinnefs of their pe 



but, I fuppofe 



the greater facility that fome parts of them poffefs in parting with 



oxygen, when expofed to the fu 



o 



ht, than other parts of 



them 



I 



open. 



for 



flow 



more 



In the filk manufa£tory 



lefs etiolated, before they firfl 



r 



triable colour is produced by 



making the warp of 



nd the woof of anoth 



the variable colour of a peacock's tail may be owing 

 different coloured down placed in lines near each oth 



; perhaps 



mixture of 



I 



II. Flowers from Buds 



1. The flowers ariflng from the buds of flirubs or tr^es are liable 

 to become double or full by the multiplication' of their petals, as 

 thofe of rofes, cherries, hawthorn, peach, rofa, prunus, cerafus, era- 

 tegus oxyacantha, amygdalus perfica. Which tendency to duplica- 

 turci as in the flowers of annual plants, is probably owing to the 

 too vigorous growth of the bud from a too nutritious foil, or the 

 combination of abundant moifiure and warmth, and would probably 

 be forwarded by furrounding the bud itfelf frequently with water j 

 as is fo beautifully feen in thofe plants, which have a cup round 

 their joints to preferve for a time the rain, which falls upon them, ' 

 as round th>e joints of dypfacus, teafel, fllphium, tillandlia, and ne«- 



f>en 



thes. 



" ; 



It is remarkable, that though the duplicature of many flowers i% 

 believed to have be^ owing to the more nutritious foil, in which 



they 



V 



